1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2020 The FreeBSD Foundation
5  *
6  * This software was developed by Tiger Gao under sponsorship from
7  * the FreeBSD Foundation.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions are
11  * met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in
16  *    the documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30 
31 #include <assert.h>
32 #include <gelf.h>
33 #include <libelf.h>
34 #include <limits.h>
35 #include <stdint.h>
36 
37 #include "_libelf.h"
38 
39 Elf32_Chdr *
40 elf32_getchdr(Elf_Scn *s)
41 {
42 	return (_libelf_getchdr(s, ELFCLASS32));
43 }
44 
45 Elf64_Chdr *
46 elf64_getchdr(Elf_Scn *s)
47 {
48 	return (_libelf_getchdr(s, ELFCLASS64));
49 }
50 
51 GElf_Chdr *
52 gelf_getchdr(Elf_Scn *s, GElf_Chdr *d)
53 {
54 	int ec;
55 	void *ch;
56 	Elf32_Chdr *ch32;
57 	Elf64_Chdr *ch64;
58 
59 	if (d == NULL) {
60 		LIBELF_SET_ERROR(ARGUMENT, 0);
61 		return (NULL);
62 	}
63 
64 	if ((ch = _libelf_getchdr(s, ELFCLASSNONE)) == NULL)
65 		return (NULL);
66 
67 	ec = s->s_elf->e_class;
68 	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
69 
70 	if (ec == ELFCLASS32) {
71 		ch32 = (Elf32_Chdr *)ch;
72 
73 		d->ch_type = (Elf64_Word)ch32->ch_type;
74 		d->ch_size = (Elf64_Xword)ch32->ch_size;
75 		d->ch_addralign = (Elf64_Xword)ch32->ch_addralign;
76 	} else {
77 		ch64 = (Elf64_Chdr *)ch;
78 		*d = *ch64;
79 	}
80 
81 	return (d);
82 }
83